class A {}
class B {}
class C extends B {}
$obj=new ReflectionClass('C');
var_dump($obj->isSubclassOf ('A')); //boolean false
var_dump($obj->isSubclassOf ('B')); //boolean true
ReflectionClass::isSubclassOf
(PHP 5, PHP 7, PHP 8)
ReflectionClass::isSubclassOf — Checks if a subclass
Description
Checks if the class is a subclass of a specified class or implements a specified interface.
Parameters
-
class -
Either the name of the class as string or a ReflectionClass object of the class to check against.
Return Values
Returns true on success or false on failure.
See Also
- ReflectionClass::isInterface() - Checks if the class is an interface
- ReflectionClass::implementsInterface() - Implements interface
- is_subclass_of() - Checks if the object has this class as one of its parents or implements it
- get_parent_class() - Retrieves the parent class name for object or class
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User Contributed Notes 2 notes
dhairya lakhera ¶
8 years ago
voitcus at gmail dot com ¶
5 years ago
Note, that this method is a bit different than the `instanceof` operator, which returns true, when it is a subclass or the very same class (interface). Here, only being a subclass results in true, eg.
class A {}
class B extends A {}
$a = new ReflectionClass('A');
$AA = new A;
$b = new ReflectionClass('B');
$BB = new B;
var_dump($a->isSubclassOf($b)); // false
var_dump($AA instanceof $BB); // false
var_dump($b->isSubclassOf($a)); // true
var_dump($BB instanceof $AA); // true
var_dump($a->isSubclassOf($a)); // false
var_dump($AA instanceof $AA); // true
